Dr.A.P.J.Abdul Kalam University
Bachelor of Engineering
Seventh Semester Main Examination, Dec-2020
Network and Web Security [CS-7101]
Branch: CSE
Time: 3:00 Hrs Max Marks 70
Note : 1. Attempt any five questions out of eight.
2. Each question having two parts and each part carries 7 marks.
Q.1 (a) What do you understand by network security attack? Describe with examples.
(b) Describe active and passive attacks. Discuss different types of active attack and passive
attack?
Q.2 (a) List different types of cryptanalytic attacks based on what is known to the attacker.
(b) Discuss model for internetwork security. Describe each component in detail.
Q.3 (a) What is cipher? Discuss any two substitution cipher (Caesar cipher and Hill cipher).
(b) What is the difference between an unconditionally secure cipher and computationally secure
cipher?
Q.4 (a) Describe different security attack (passive and active) with detail subcategories from each.
(b) Describe different possible security services provided by a system
Q.5 (a) What is digital signature? How public key cryptography is used for digital signature.
(b) Describe Diffie-Hellman key exchange algorithm, discuss the basis of the strength of this
algorithm.
Q.6 (a) What is confusion and diffusion in Shannon theory of block cipher.
(b)What is permutation and substitution in DES. What is avalanche effect in DES.
Q.7 (a) What is X.509 authentication services. What is X.509 certificate format? Discuss 1-way, 2-
way, 3-way communication using X.509 certificate.
(b) Describe RSA algorithm with an example, discuss the basis of the strength of this algorithm.
Q.8 (a) Describe the following:-
(i) Authentication
(ii) Access control
(iii) Data confidentiality
(iv) Data integrity
(b) What is a computer virus? Different phases of computer virus that it goes through in its
lifetime. Describe its structure
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